how come when you speed up an audio track, the pitch also (usually) goes up?

Question

how come when you speed up an audio track, the pitch also (usually) goes up?

In: 38

Answer 1

I think [this image will help](https://www.vedantu.com/question-sets/b4470de2-50e2-41be-8357-39782c1791ab7878403365382370013.png)

Imagine those up and downs as the sound wave over time. The long up and downs are a low pitch and the short up and downs are a high pitch.

Now imagine making the top sound wave half as long by stretching it. It would look like the high pitch sound. That’s basically what speeding up an audio track does.

To not change the pitch when speeding a track up software needs to do a lot of work to change the sound waves back to low pitch.